Molecular Characterization of Water- and Methanol-Soluble Organic Compounds Emitted from Residential Coal Combustion Using Ultrahigh-Resolution Electrospray Ionization Fourier Transform Ion Cyclotron Resonance Mass Spectrometry

Water-soluble organic compounds (WSOC) and methanol-soluble organic compounds (MSOC) in smoke particles emitted from residential coal combustion were characterized by ultrahigh-resolution mass spectrometry. The results showed that the molecular compositions of WSOC and MSOC are different. S-containi...

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Bibliographic Details
Published in:Environmental science & technology 2019-12, Vol.53 (23), p.13607-13617
Main Authors: Song, Jianzhong, Li, Meiju, Fan, Xingjun, Zou, Chunlin, Zhu, Mengbo, Jiang, Bin, Yu, Zhiqiang, Jia, Wanglu, Liao, Yuhong, Peng, Ping’an
Format: Article
Language:English
Subjects:
Absorption
Aromaticity
Biomass burning
Burning
Chemical composition
Coal
Combustion
Cyclotron resonance
Cyclotrons
Electromagnetic absorption
Fourier Analysis
Fourier transforms
Functional groups
Ionization
Ions
Mass Spectrometry
Mass spectroscopy
Maturity
Methanol
Organic chemistry
Organic compounds
Polarity
Scientific imaging
Smoke
Spectrometry, Mass, Electrospray Ionization
Spectroscopy
Water
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Summary:Water-soluble organic compounds (WSOC) and methanol-soluble organic compounds (MSOC) in smoke particles emitted from residential coal combustion were characterized by ultrahigh-resolution mass spectrometry. The results showed that the molecular compositions of WSOC and MSOC are different. S-containing compounds (CHOS and CHONS) are found to be the dominant components (65–87%) of the WSOC, whereas CHO and CHON compounds make a great contribution (79–96%) to the MSOC samples. It is worth noting that greater abundance of S-containing compounds was found in smoke produced from coal combustion compared to biomass burning and atmospheric samples. The molecular compositions of WSOC and MSOC also varied significantly depending on the maturity of the coal. The WSOC and MSOC derived from the combustion of low-maturity coal contained a higher proportion of oxidized functional groups but with a lower degree of aromaticity than the compounds derived from the combustion of high-maturity coal. Our findings suggest that organic molecules with a high modified aromaticity index, low O/C ratio, and low polarity showed stronger light absorption. This study also suggests that CHO and CHON compounds significantly contributed to the light absorption of WSOC and MSOC and that the contribution of CHON may be stronger.
ISSN:0013-936X
1520-5851
DOI:10.1021/acs.est.9b04331